WO1994007024A1 - Valve needle for an electromagnetically controlled valve and process for producing the same - Google Patents

Valve needle for an electromagnetically controlled valve and process for producing the same Download PDF

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Publication number
WO1994007024A1
WO1994007024A1 PCT/DE1993/000759 DE9300759W WO9407024A1 WO 1994007024 A1 WO1994007024 A1 WO 1994007024A1 DE 9300759 W DE9300759 W DE 9300759W WO 9407024 A1 WO9407024 A1 WO 9407024A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
section
closing member
armature
valve needle
Prior art date
Application number
PCT/DE1993/000759
Other languages
German (de)
French (fr)
Inventor
Peter Romann
Ferdinand Reiter
Martin Maier
Thomas Naeger
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to US08/240,704 priority Critical patent/US5566920A/en
Priority to EP93918902A priority patent/EP0612375B1/en
Priority to KR1019940701566A priority patent/KR100292420B1/en
Priority to JP6507648A priority patent/JPH07501377A/en
Priority to DE59306788T priority patent/DE59306788D1/en
Publication of WO1994007024A1 publication Critical patent/WO1994007024A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
    • F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
    • F02M51/0664—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding
    • F02M51/0671—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto
    • F02M51/0682—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding the armature having an elongated valve body attached thereto the body being hollow and its interior communicating with the fuel flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8046—Fuel injection apparatus manufacture, repair or assembly the manufacture involving injection moulding, e.g. of plastic or metal

Definitions

  • the invention is based on a valve needle for an electromagnetically actuated valve or on a method for producing a valve needle according to the preamble of claim 1 or claim 8.
  • DE-OS 40 08 675 describes a valve needle for a Electromagnetically actuated valve is known, which consists of an armature section, a valve closing member section and a valve sleeve section connecting the armature section to the valve closing glow section.
  • the armature section is connected to one end of the valve sleeve section by means of a first welded connection and the valve closing member section is connected to the other end of the valve sleeve section by means of a second welded connection. Two welding operations are therefore required to produce the valve needle, which lead to a relatively complex and expensive manufacture of the valve needle.
  • valve needle according to the invention with the characterizing features of claim 1 and the method according to the invention with the characterizing features of claim 8, on the other hand, have the advantage that such a valve needle can be manufactured in a simple and inexpensive manner.
  • the composition of the metal powder used can easily be matched to optimal magnetic properties of the armature section.
  • the presence of sulfur and carbon, which can adversely affect the quality of a weld between the valve closing member section and the valve sleeve section, can easily be avoided.
  • the longitudinal opening of the valve sleeve section has a bottom near its end facing the valve closing member section.
  • a cavity is formed between the base and the valve closing member section, in which welding spatter, which is produced between the valve closing member section and the valve sleeve section during the production of the white weld connection, is enclosed and cannot impair the function of the valve.
  • valve sleeve section tapers from the armature section in the direction of the valve closing member section.
  • recesses are formed in the wall of the longitudinal opening of the valve sleeve section, which extend in the direction of the valve longitudinal axis, so that the flow through the longitudinal opening of the valve sleeve section is not impeded.
  • the direct formation of a base at the end of the valve sleeve section facing the valve closing member section also offers the advantage of keeping welding spatter away from the interior of the valve sleeve section.
  • valve needle is obtained when it is manufactured with the armature section, the valve sleeve section and the valve closing member section as a molded part according to the metal injection molding process.
  • the molded part is hot isostatically pressed after sintering, so that there is a particularly dense structure of the valve needle or of the actuating part consisting of the armature section and valve sleeve section.
  • FIG. 1 shows a fuel injection valve with an invented valve needle according to a first embodiment
  • FIG. 2 shows the valve needle according to the first embodiment
  • FIG. 3 shows a valve needle according to a second embodiment according to the invention
  • FIG. 4 shows a third embodiment of a valve needle according to the invention
  • FIG. 5 shows a fourth embodiment of a valve needle according to the invention
  • FIG. 6 an inventive manufacturing method of a valve needle.
  • the electromagnetically operable valve shown in FIG. 1, for example, in the form of an injection valve for fuel injection systems of mixed-compression spark-ignition internal combustion engines has a core 2 surrounded by a magnet coil 1 and serving as a fuel inlet connector.
  • the magnet coil 1 with a coil body 3 is for example see ver ⁇ with a plastic coating 5, at the same time an electrical connector 6 is injected mitange ⁇ .
  • a pipe-shaped, metallic intermediate part 12 is connected, for example by welding, concentrically to a longitudinal valve axis 11 and thereby overlaps the core end 10 partially axially with an upper cylinder section 14.
  • the coil former 3 partially overlaps the core 2 and the upper cylinder section 14 of the intermediate part 12.
  • the intermediate part 12 is provided at its end facing away from the core 2 with a lower cylinder section 18 which overlaps a tubular nozzle carrier 19 and passes through it, for example Welding is tightly connected.
  • a cylindrical valve seat body 21 is tightly mounted by welding in a through bore 20 which runs concentrically to the longitudinal axis 11 of the valve.
  • the valve seat body 21 has a fixed valve seat 22 facing the magnetic coil 1, downstream of the valve seat 22.
  • two spray openings 23 are formed in the valve seat body 21. Downstream of the spray openings 23, the valve seat body 21 has a treatment bore 24 which widens in the shape of a truncated cone in the direction of flow.
  • a tubular adjusting bushing 27 is pressed into a stepped flow bore 25 of the core 2 that runs concentrically to the valve longitudinal axis 11.
  • the return spring 26 rests with its one end against a lower end face 28 of the adjusting bushing 27 facing the valve seat body 21.
  • the press-in depth of the adjusting bush 27 into the flow bore 25 of the core 2 determines the spring force of the return spring 26 and thus also influences the dynamic fuel quantity emitted during the opening and closing stroke of the valve.
  • the return spring 26 With its end facing away from the adjusting bush 27, the return spring 26 is supported on a holding shoulder 30 of a tubular, e.g. Actuating part 32 arranged concentrically to the longitudinal valve axis 11.
  • the actuating part 32 has a longitudinal opening 34 which, facing the core 2, merges into the holding shoulder 30.
  • a valve needle 58 according to the first exemplary embodiment shown in FIG. 1 is also shown in FIG. 2.
  • the tubular actuating part 32 consists of a tubular armature section 36, which faces the core 2 and cooperates with the core 2 and the magnetic coil 1, and a tubular valve sleeve section 38 which faces the valve seat body 21. Near its end 39, which faces away from the armature section 35 a bottom 40 is formed in the longitudinal opening 34 of the actuating part 32.
  • the bottom 40 divides the longitudinal opening 34 of the actuating part 32 into a blind-shaped flow section 42 facing the core 2, which forms an extension of the flow bore 25 of the core 2, and one in comparison to the flow section 42 has only a slight axial extension of the blind hole section 44.
  • valve sleeve section 38 At the end 39 of the valve sleeve section 38, the actuating part 32 is connected to a, for example, spherical valve closing member section 46 by means of a welded connection 48.
  • the valve sleeve section 38 of the actuating part 32 has at its end 39 facing away from the holding shoulder 30 an end-side, for example dome-shaped contact surface 49.
  • Valve sleeve section 38 and valve closing member section 46 generally have a smaller diameter than the armature section 36.
  • The, for example, spherical valve closing member section 46 has, for example, four flats 50 on its circumference, which facilitate the flow of fuel in the direction of the valve seat 22 of the valve seat body 21.
  • a cavity 52 is formed, in which the welding spatter formed during the production of the weld connection 48, for example by means of laser welding, accumulates. These weld spatter cannot escape from the cavity 52 and reach the valve seat 22, for example, so that the function of the valve is not disturbed.
  • a plurality of through openings 56 are provided which pass through the wall of the valve sleeve section 38. These through openings 56 allow the fuel to flow through the flow bore 25 of the core 2 and the longitudinal opening 34 of the actuating part 32 in the direction of the valve seat 22 of the valve seat body 21.
  • the actuating part 32 consisting of the armature section 36 and the valve sleeve section 38, and possibly also the valve closing member section 46 of the valve needle 58 are made by injection molding and closing sintering.
  • FIG. 6 shows the method according to the invention for producing a valve needle in a simplified manner.
  • the process also known as metal injection molding (MIM), comprises the production of molded parts from a metal powder with a binder, for example a plastic binder, for example on conventional plastic injection molding machines, and the subsequent removal of the binder and sintering of the remaining metal powder structure.
  • MIM metal injection molding
  • the composition of the metal powder can be matched in a simple manner to optimal magnetic properties of the actuating part 32 consisting of the armature section 36 and the valve sleeve section 38 or the valve closing member section 46. Sulfur and / or carbon in the metal powder, which have a negative effect on a possible welded connection 48 between valve closing member section 46 and valve sleeve section 38, can be avoided.
  • the metal powder 61 is mixed with the plastic used as the binder 62 in a mixing device 63 and homogenized. This mixture is then processed into granules in a granulating device 64 and further processed in a manner known per se into a molded part 66 by means of a plastic injection molding machine 65.
  • the components of the plastic binder 62 are then removed from the injection-molded part 66 by thermal processes, for example under the influence of protective gas.
  • the remaining material structure of the molded part 66 now consists of approximately 60 percent by volume of metal.
  • the molded part is sintered, for example, under the influence of protective gas in a sintering device 68.
  • the sintering process can also be carried out under the influence of hydrogen or in a vacuum.
  • the molded part 66 can then be densified by hot isostatic pressing in order to reduce the proportion of pores in the structure of the actuating part 32 or the valve needle 58 to approximately 1%.
  • the actuating part 32 thus obtained, consisting of the armature section 36 and the valve sleeve section 38, is firmly connected to the valve closing member section 46, for example by a welded connection 48.
  • the magnetic coil 1 is at least partially surrounded by at least one guide element 81, for example in the form of a bracket, which serves as a ferromagnetic element and which bears at one end on the core 2 and at the other end on the nozzle carrier 19 and with these e.g. is connected by welding or soldering.
  • a part of the valve is enclosed by a plastic sheath 83, which extends from the core 2 in the axial direction over the magnet coil 1 with connector 6 and the at least one guide element 81.
  • FIG. 3 shows a second exemplary embodiment of a valve needle 58 according to the invention.
  • the valve needle 58 consists of the actuating part 32 and the valve closing member section 46 connected to this actuating part by a welded connection 48 on the contact surface 49 of the end 39 of the actuating part.
  • the actuating part 32 facing away from the valve closing member section 46, the armature section 36 and the valve sleeve section 38 extending between the armature section 36 and the valve closing member section 46.
  • the actuating part 32 is designed such that the valve sleeve section 38 tapers in the shape of a truncated cone in the direction of the valve closing member section 46 in the direction of the valve closing member section 46 .
  • This conical shape of the valve sleeve section 38 facilitates the demolding of the actuating part 32 from the tools used for its manufacture, for example from a form of the plastic injection molding machine 65 or the sintering device 68.
  • the longitudinal opening 34 of the actuating part 32 there are, for example, four in the direction of the valve longitudinal axis 11 extending recesses 85 are formed. which allow the weight of the valve needle 58 to be reduced without compromising its mechanical strength.
  • recesses 85 are formed on the wall of the longitudinal opening 34 of the actuating part 32 in the radial direction inwardly pointing webs 87, which together with their end facing away from the valve closing member section 46 together form the retaining shoulder 30 for the return spring 26.
  • valve needle 58 according to the second exemplary embodiment shown in FIG. 3 does not differ significantly from the first exemplary embodiment shown in FIG.
  • FIG. 58 differs from FIG. 4 only from the first exemplary embodiment according to FIGS. 1 and 2 in that the bottom 40 directly forms the end 39 of the actuating part 32 opposite the anchor section 36 and concavely corresponds approximately to the contour of the spherically shaped valve closing member section 46 is trained.
  • the valve closing member section 46 lies against the bottom 40 and is connected to it by means of the welded connection 48.
  • the cavity 52 of the previous exemplary embodiments is eliminated in the third exemplary embodiment.
  • valve needle 58 In the fourth exemplary embodiment of a valve needle 58 according to the invention according to FIG. 5, armature section 36, valve sleeve section 38 and valve closing member section 46 are produced as one part according to the MIM method described above.
  • the longitudinal opening 34 advantageously extends into the valve closing member section 46. Welded connections are not present in the fourth embodiment according to FIG. 5.
  • the new valve needle with an injection molded section and subsequent sintering, consisting of armature section 36 and valve sleeve Section 38 existing actuating part 32 or with the valve closing member section 46, which is also manufactured at the same time, has the advantage of very simple and inexpensive production, in which the welding operation between the armature section 36 and the valve sleeve section 38 and possibly also between the valve sleeve section 38 and the valve closing member section 46 is eliminated.
  • the cavity 52 formed by the blind hole section 44 of the longitudinal opening 34 of the actuating part 32 and the valve closing member section 46 leads to the fact that, in the exemplary embodiments according to FIGS. 1 to 4, the welded connection 48 is formed between the valve closing member section 46 and the end 39 of the actuating part 32 resulting welding spatter remain in the cavity 52 and cannot interfere with the function of the valve.

Abstract

In known electromagnetically controllable valves the valve needle consists of a tubular armature section, a tubular valve sleeve section and a valve closing member section. The armature section is linked to the first end of the valve sleeve section by means of a first solder and the valve closing member section is linked to the other end of the valve sleeve section by means of a second solder. This production process is relatively expensive and costly because of the two soldering operations required. In a new valve needle (58), a tubular actuating part (31) consisting of an armature section (36) and of a valve sleeve section (38) is produced by injection moulding followed by sintering, according to the metal injection moulding process. The actuating part (32) is then linked to a valve closing member section (46) by means of a solder, so that the valve needle (58) can thus be produced in a simple and economical manner. This valve needle is particularly suitable for injection valves in fuel injection systems of internal combustion engines.

Description

Ventilnadel für ein elektromagnetisch betätigbares Ventil und Verfahren zur HerstellungValve needle for an electromagnetically actuated valve and method of manufacture
Stand der TechnikState of the art
Die Erfindung geht aus von einer Ventilnadel für ein elektromagne¬ tisch betätigbares Ventil bzw. von einem Verfahren zur Herstellung einer Ventilnadel nach der Gattung des Anspruches 1 bzw. des An¬ spruches 8. Aus der DE-OS 40 08 675 ist eine Ventilnadel für ein elektromagnetisch betätigbares Ventil bekannt, die aus einem Anker¬ abschnitt, einem Ventilschließgliedabschnitt und einem den Anker¬ abschnitt mit dem Ventilschließgliödabschnitt verbindenden Ventil¬ hülsenabschnitt besteht. Der Ankerabschnitt ist mit einem Ende des Ventilhülsenabschnittes mittels einer ersten Schweißverbindung und der Ventilschließgliedabschnitt mit dem anderen Ende des Ventilhül¬ senabschnittes mittels einer zweiten Schweißverbindung verbunden. Zur Herstellung der Ventilnadel sind also zwei Schweißarbeitsgänge erforderlich, die zu einer relativ aufwendigen und teuren Fertigung der Ventilnadel führen. Zudem besteht die Gefahr, daß beim Herstel¬ len der zweiten Schweißverbindung zwischen dem Ventilschließglied¬ abschnitt und dem rohrförmigen Ventilhülsenabschnitt Schweißspritzer entstehen, die sich an der inneren Wandung des rohrförmigen Ventil¬ hülsenabschnittes ablagern und die Funktion des Ventils beeinträch¬ tigen. Vorteile der ErfindungThe invention is based on a valve needle for an electromagnetically actuated valve or on a method for producing a valve needle according to the preamble of claim 1 or claim 8. DE-OS 40 08 675 describes a valve needle for a Electromagnetically actuated valve is known, which consists of an armature section, a valve closing member section and a valve sleeve section connecting the armature section to the valve closing glow section. The armature section is connected to one end of the valve sleeve section by means of a first welded connection and the valve closing member section is connected to the other end of the valve sleeve section by means of a second welded connection. Two welding operations are therefore required to produce the valve needle, which lead to a relatively complex and expensive manufacture of the valve needle. In addition, there is the risk that during the production of the second welded connection between the valve closing member section and the tubular valve sleeve section, weld spatters will form which are deposited on the inner wall of the tubular valve sleeve section and impair the function of the valve. Advantages of the invention
Die erfindungsgemäße Ventilnadel mit den kennzeichnenden Merkmalen des Anspruches 1 bzw. das erfindungsgemäße Verfahren mit den kenn¬ zeichnenden Merkmalen des Anspruches 8 haben demgegenüber den Vor¬ teil, daß eine solche Ventilnadel auf einfache und kostengünstige Art und Weise herstellbar ist. Die Zusammensetzung des verwendeten Metallpulvers kann dabei einfach auf optimale magnetische Eigen¬ schaften des Ankerabschnittes abgestimmt werden. Das Vorhandensein von Schwefel und Kohlenstoff, die sich nachteilig auf die Qualität einer Schweißung zwischen Ventilschließgliedabschnitt und Ventilhülsenabschnitt auswirken können, läßt sich einfach vermeiden.The valve needle according to the invention with the characterizing features of claim 1 and the method according to the invention with the characterizing features of claim 8, on the other hand, have the advantage that such a valve needle can be manufactured in a simple and inexpensive manner. The composition of the metal powder used can easily be matched to optimal magnetic properties of the armature section. The presence of sulfur and carbon, which can adversely affect the quality of a weld between the valve closing member section and the valve sleeve section, can easily be avoided.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vor¬ teilhafte Weiterbildungen und Verbesserungen der im Anspruch 1 ange¬ gebenen Ventilnadel und des im Anspruch 8 angegebenen Verfahrens möglich.Advantageous further developments and improvements of the valve needle specified in claim 1 and of the method specified in claim 8 are possible through the measures listed in the subclaims.
Besonders vorteilhaft ist es, wenn die Längsöffnung des Ventilhül¬ senabschnittes nahe ihrem dem Ventilschließgliedabschnitt zugewand¬ ten Ende einen Boden hat. Zwischen dem Boden und dem Ventilschlie߬ gliedabschnitt wird auf diese Weise ein Hohlraum gebildet, in dem Schweißspritzer, die beim Herstellen der Sehweißverbindung zwischen Ventilschließgliedabschnitt und Ventilhülsenabschnitt entstehen, eingeschlossen werden und die Funktion des Ventils nicht beeinträch¬ tigen können.It is particularly advantageous if the longitudinal opening of the valve sleeve section has a bottom near its end facing the valve closing member section. In this way, a cavity is formed between the base and the valve closing member section, in which welding spatter, which is produced between the valve closing member section and the valve sleeve section during the production of the white weld connection, is enclosed and cannot impair the function of the valve.
Für eine gute Entformung aus den bei der Herstellung verwendeten Formwerkzeugen ist es vorteilhaft, wenn sich der Ventilhülsen¬ abschnitt ausgehend von dem Ankerabschnitt in Richtung des Ventil¬ schließgliedabschnittes verjüngt. Zur Reduzierung des Gewichtes der Ventilnadel ist es vorteilhaft, wenn in der Wandung der Längsöffnung des Ventilhülsenabschnittes Ausnehmungen ausgebildet sind, die sich in Richtung zu der Ventil¬ längsachse erstrecken, so daß die Strömung durch die Längsöffnung des Ventilhülsenabschnittes nicht behindert wird.For good demolding from the molds used in the production, it is advantageous if the valve sleeve section tapers from the armature section in the direction of the valve closing member section. To reduce the weight of the valve needle, it is advantageous if recesses are formed in the wall of the longitudinal opening of the valve sleeve section, which extend in the direction of the valve longitudinal axis, so that the flow through the longitudinal opening of the valve sleeve section is not impeded.
Die direkte Ausbildung eines Bodens am dem Ventilschließglied¬ abschnitt zugewandten Ende des Ventilhülsenabschnittes bietet eben¬ falls den Vorteil des Fernhaltens von Schweißspritzern aus dem Inne¬ ren des Ventilhülsenabschnittes.The direct formation of a base at the end of the valve sleeve section facing the valve closing member section also offers the advantage of keeping welding spatter away from the interior of the valve sleeve section.
Eine besonders vorteilhafte Ausgestaltung der Ventilnadel ergibt sich dann, wenn sie mit dem Ankerabschnitt, dem Ventilhülsen- abschnitt und dem Ventilschließgliedabschnitt als ein Formteil nach dem Metal-Injection-Molding-Verfahren hergestellt ist.A particularly advantageous embodiment of the valve needle is obtained when it is manufactured with the armature section, the valve sleeve section and the valve closing member section as a molded part according to the metal injection molding process.
Von Vorteil ist es, wenn als Bindemittel ein Kunststoffbindemittel verwendet wird und, wenn dieses Bindemittel durch eine thermische Behandlung des Formteils aus diesem Formteil entfernt wird. Auf diese Weise wird eine besonders einfache Herstellung eines die Ven¬ tilnadel bzw. das Betätigungsteil bildenden Formteiles ermöglicht, das bereits eine hohe Gefügedichte aufweist.It is advantageous if a plastic binder is used as the binder and if this binder is removed from this molded part by thermal treatment of the molded part. In this way, a particularly simple manufacture of a molded part which forms the valve needle or the actuating part is made possible and which already has a high structural density.
Besonders vorteilhaft ist es, wenn das Formteil nach dem Sintern heißisostatisch gepreßt wird, so daß sich ein besonders dichtes Ge¬ füge der Ventilnadel bzw. des aus Ankerabschnitt und Ventilhülsen¬ abschnitt bestehenden Betätigungsteiles ergibt.It is particularly advantageous if the molded part is hot isostatically pressed after sintering, so that there is a particularly dense structure of the valve needle or of the actuating part consisting of the armature section and valve sleeve section.
Zeichnungdrawing
Ausführungsbeispiele der Erfindung sind in der Zeichnung vereinfacht dargestellt und in der nachfolgenden Beschreibung näher erläutert. Es zeigen Figur 1 ein Brennstoffeinspritzventil mit einer erfin- dungsgemäßen Ventilnadel gemäß eines ersten Ausführungsbeispiels, Figur 2 die Ventilnadel gemäß des ersten Ausführungsbeispiels, Figur 3 eine Ventilnadel gemäß eines zweiten erfindungsgemäßen Ausfüh¬ rungsbeispiels, Figur 4 ein drittes Ausführungsbeispiel einer erfin¬ dungsgemäßen Ventilnadel, Figur 5 ein viertes Ausführungsbeispiel einer erfindungsgemäßen Ventilnadel, Figur 6 ein erfindungsgemäßes Herstellungsverfahren einer Ventilnadel.Embodiments of the invention are shown in simplified form in the drawing and explained in more detail in the following description. FIG. 1 shows a fuel injection valve with an invented valve needle according to a first embodiment, FIG. 2 shows the valve needle according to the first embodiment, FIG. 3 shows a valve needle according to a second embodiment according to the invention, FIG. 4 shows a third embodiment of a valve needle according to the invention, FIG. 5 shows a fourth embodiment of a valve needle according to the invention, FIG. 6 an inventive manufacturing method of a valve needle.
Beschreibung der AusführungsbeispieleDescription of the embodiments
Das in der Figur 1 beispielsweise dargestellte elektromagnetisch be¬ tätigbare Ventil in der Form eines Einspritzventils für Brennstoff¬ einspritzanlagen von gemischverdichtenden fremdgezündeten Brenn- kraftmaschinen hat einen von einer Magnetspule 1 umgebenen, als Brennstoffeinlaßstutzen dienenden Kern 2. Die Magnetspule 1 mit ei¬ nem Spulenkörper 3 ist z.B. mit einer Kunststoffumspritzung 5 ver¬ sehen, wobei zugleich ein elektrischer Anschlußstecker 6 mitange¬ spritzt ist.The electromagnetically operable valve shown in FIG. 1, for example, in the form of an injection valve for fuel injection systems of mixed-compression spark-ignition internal combustion engines has a core 2 surrounded by a magnet coil 1 and serving as a fuel inlet connector. The magnet coil 1 with a coil body 3 is for example see ver¬ with a plastic coating 5, at the same time an electrical connector 6 is injected mitange¬.
Mit einem unteren Kernende 10 des Kerns 2 ist konzentrisch zu einer Ventillängsachse 11 dicht ein rohrför iges, metallenes Zwischenteil 12 beispielsweise durch Schweißen verbunden und übergreift dabei mit einem oberen Zylinderabschnitt 14 das Kernende 10 teilweise axial. Der Spulenkörper 3 übergreift teilweise den Kern 2 und den oberen Zylinderabschnitt 14 des Zwischenteils 12. Das Zwischenteil 12 ist an seinem dem Kern 2 abgewandten Ende mit einem unteren Zylinder¬ abschnitt 18 versehen, der einen rohrförmigen Düsenträger 19 über¬ greift und mit diesem beispielsweise durch Schweißen dicht verbunden ist. In das stromabwärts liegende Ende des Düsenträgers 19 ist in einer konzentrisch zu der Ventillängsachse 11 verlaufenden Durch¬ gangsbohrung 20 ein zylinderförmiger Ventilsitzkörper 21 durch Schweißen dicht montiert. Der Ventilsitzkörper 21 weist der Magnet¬ spule 1 zugewandt einen festen Ventilsitz 22 auf, stromabwärts des- sen im Ventilsitzkörper 21 z.B. zwei Abspritzöffnungen 23 ausgebil¬ det sind. Stromabwärts der Abspritzöffnungen 23 hat der Ventilsitz¬ körper 21 eine sich in Strömungsrichtung kegelstumpfförmig erwei¬ ternde Aufbereitungsbohrung 24.With a lower core end 10 of the core 2, a pipe-shaped, metallic intermediate part 12 is connected, for example by welding, concentrically to a longitudinal valve axis 11 and thereby overlaps the core end 10 partially axially with an upper cylinder section 14. The coil former 3 partially overlaps the core 2 and the upper cylinder section 14 of the intermediate part 12. The intermediate part 12 is provided at its end facing away from the core 2 with a lower cylinder section 18 which overlaps a tubular nozzle carrier 19 and passes through it, for example Welding is tightly connected. In the downstream end of the nozzle carrier 19, a cylindrical valve seat body 21 is tightly mounted by welding in a through bore 20 which runs concentrically to the longitudinal axis 11 of the valve. The valve seat body 21 has a fixed valve seat 22 facing the magnetic coil 1, downstream of the valve seat 22. For example, two spray openings 23 are formed in the valve seat body 21. Downstream of the spray openings 23, the valve seat body 21 has a treatment bore 24 which widens in the shape of a truncated cone in the direction of flow.
In eine konzentrisch zu der Ventillängsachse 11 verlaufende abge¬ stufte Strömungsbohrung 25 des Kerns 2 ist zur Einstellung der Fe¬ derkraft einer Rückstellfeder 26 eine rohrförmige Einstellbuchse 27 eingepreßt. Die Rückstellfeder 26 liegt mit ihrem einen Ende an ei¬ ner dem Ventilsitzkörper 21 zugewandten unteren Stirnseite 28 der Einstellbuchse 27 an. Die Einpreßtiefe der Einstellbuchse 27 in die Strömungsbohrung 25 des Kerns 2 bestimmt die Federkraft der Rück¬ stellfeder 26 und beeinflußt damit auch die dynamische, während des Öffnungs- und des Schließhubes des Ventils abgegebene Brennstoff¬ menge. Mit ihrem der Einstellbuchse 27 abgewandten Ende stützt sich die Rückstellfeder 26 an einem Halteabsatz 30 eines rohrförmigen, z.B. konzentrisch zu der Ventillängsachse 11 angeordneten Betäti¬ gungsteiles 32 ab. Das Betätigungsteil 32 weist eine Längsöffnung 34 auf, die dem Kern 2 zugewandt in den Halteabsatz 30 übergeht.In order to adjust the spring force of a return spring 26, a tubular adjusting bushing 27 is pressed into a stepped flow bore 25 of the core 2 that runs concentrically to the valve longitudinal axis 11. The return spring 26 rests with its one end against a lower end face 28 of the adjusting bushing 27 facing the valve seat body 21. The press-in depth of the adjusting bush 27 into the flow bore 25 of the core 2 determines the spring force of the return spring 26 and thus also influences the dynamic fuel quantity emitted during the opening and closing stroke of the valve. With its end facing away from the adjusting bush 27, the return spring 26 is supported on a holding shoulder 30 of a tubular, e.g. Actuating part 32 arranged concentrically to the longitudinal valve axis 11. The actuating part 32 has a longitudinal opening 34 which, facing the core 2, merges into the holding shoulder 30.
Eine Ventilnadel 58 gemäß dem in der Figur 1 dargeteilten ersten Ausführungsbeispiel ist ebenfalls in Figur 2 gezeigt.A valve needle 58 according to the first exemplary embodiment shown in FIG. 1 is also shown in FIG. 2.
Das rohrförmige Betätigungsteil 32 besteht aus einem rohrförmig aus¬ gebildeten, dem Kern 2 zugewandten und mit dem Kern 2 sowie der Magnetspule 1 zusammenwirkenden Ankerabschnitt 36 und einem sich dem Ventilsitzkörper 21 zugewandt erstreckenden rohrförmigen Ventilhül¬ senabschnitt 38. Nahe ihres dem Ankerabschnitt 35 abgewandten Endes 39 ist in der Längsöffnung 34 des Betätigungsteils 32 ein Boden 40 ausgebildet. Der Boden 40 unterteilt die Längsöffnung 34 des Betäti¬ gungsteils 32 in einen dem Kern 2 zugewandten, eine Verlängerung der Strömungsbohrung 25 des Kerns 2 bildenden sacklochförmigen Strö¬ mungsabschnitt 42 sowie einen im Vergleich zu dem Strömungsabschnitt 42 nur eine geringe axiale Erstreckung aufweisenden Sacklochab¬ schnitt 44. An dem Ende 39 des Ventilhülsenabschnittes 38 ist das Betätigungsteil 32 mit einem z.B. kugelförmigen Ventilschlie߬ gliedabschnitt 46 mittels einer Schweißverbindung 48 verbunden. Um eine möglichst gute Verbindung und eine exakte Zentrierung des kugelförmigen Ventilschließgliedabschnittes 46 gegenüber dem Be¬ tätigungsteil 32 zu erzielen, hat der Ventilhülsenabschnitt 38 des Betätigungsteiles 32 an seinem Ende 39 dem Halteabsatz 30 abgewandt eine stirnseitige, z.B. kalottenförmig ausgebildete Anlagefläche 49. Ventilhülsenabschnitt 38 und Ventilschließgliedabschnitt 46 haben in der Regel einen geringeren Durchmesser als der Ankerabschnitt 36. Der beispielsweise kugelförmige Ventilschließgliedabschnitt 46 weist an seinem Umfang z.B. vier Abflachungen 50 auf, die das Strömen des Brennstoffs in Richtung des Ventilsitzes 22 des Ventilsitzkörpers 21 erleichtern. Zwischen dem Boden 40 des Sacklochabschnittes 44 und dem Ventilschließgliedabschnitt 46 ist ein Hohlraum 52 gebildet, in dem sich die bei der Herstellung der Schweißverbindung 48 z.B. mittels Laserschweißen entstehenden Schweißspritzer ansammeln. Diese Schweißspritzer können aus dem Hohlraum 52 nicht austreten und z.B. zu dem Ventilsitz 22 gelangen, so daß die Funktion des Ventils nicht gestört wird.The tubular actuating part 32 consists of a tubular armature section 36, which faces the core 2 and cooperates with the core 2 and the magnetic coil 1, and a tubular valve sleeve section 38 which faces the valve seat body 21. Near its end 39, which faces away from the armature section 35 a bottom 40 is formed in the longitudinal opening 34 of the actuating part 32. The bottom 40 divides the longitudinal opening 34 of the actuating part 32 into a blind-shaped flow section 42 facing the core 2, which forms an extension of the flow bore 25 of the core 2, and one in comparison to the flow section 42 has only a slight axial extension of the blind hole section 44. At the end 39 of the valve sleeve section 38, the actuating part 32 is connected to a, for example, spherical valve closing member section 46 by means of a welded connection 48. In order to achieve the best possible connection and exact centering of the spherical valve closing member section 46 with respect to the actuating part 32, the valve sleeve section 38 of the actuating part 32 has at its end 39 facing away from the holding shoulder 30 an end-side, for example dome-shaped contact surface 49. Valve sleeve section 38 and valve closing member section 46 generally have a smaller diameter than the armature section 36. The, for example, spherical valve closing member section 46 has, for example, four flats 50 on its circumference, which facilitate the flow of fuel in the direction of the valve seat 22 of the valve seat body 21. Between the bottom 40 of the blind hole section 44 and the valve closing member section 46, a cavity 52 is formed, in which the welding spatter formed during the production of the weld connection 48, for example by means of laser welding, accumulates. These weld spatter cannot escape from the cavity 52 and reach the valve seat 22, for example, so that the function of the valve is not disturbed.
In Richtung der Ventillängsachse 11 zwischen dem Ankerabschnitt 36 und dem Boden 40 des Betätigungsteils 32 ist eine Mehrzahl von durch die Wandung des Ventilhülsenabschnittes 38 hindurchgehenden Durch¬ gangsöffnungen 56 vorgesehen. Diese Durchgangsöffnungen 56 ermög¬ lichen ein Strömen des Brennstoffs durch die Strömungsbohrung 25 des Kerns 2 und die Längsöffnung 34 des Betätigungsteils 32 in Richtung des Ventilsitzes 22 des Ventilsitzkörpers 21.In the direction of the longitudinal valve axis 11 between the armature section 36 and the bottom 40 of the actuating part 32, a plurality of through openings 56 are provided which pass through the wall of the valve sleeve section 38. These through openings 56 allow the fuel to flow through the flow bore 25 of the core 2 and the longitudinal opening 34 of the actuating part 32 in the direction of the valve seat 22 of the valve seat body 21.
Das aus dem Ankerabschnitt 36 und dem Ventilhülsenabschnitt 38 be¬ stehende Betätigungsteil 32 und ggf. auch der Ventilschließglied¬ abschnitt 46 der Ventilnadel 58 sind durch Spritzgießen und an- schließendes Sintern hergestellt. Die Figur 6 zeigt in vereinfachter Art und Weise das erfindungsgemäße Verfahren zur Herstellung einer Ventilnadel. Das auch als Metal-Injection-Molding (MIM) bezeichnete Verfahren umfaßt die Herstellung von Formteilen aus einem Metall¬ pulver mit einem Bindemittel, z.B. einem Kunststoffbindemittel bei¬ spielsweise auf konventionellen Kunststoffspritzgießmaschinen und das nachfolgende Entfernen des Bindemittels und Sintern des ver¬ bleibenden Metallpulvergerüstes. Die Zusammensetzung des Metall¬ pulvers kann dabei auf einfache Weise auf optimale magnetische Eigenschaften des aus Ankerabschnitt 36 und Ventilhülsenabschnitt 38 bestehenden Betätigungsteils 32 oder des Ventilschließgliedab¬ schnittes 46 abgestimmt werden. Schwefel und/oder Kohlenstoff in dem Metallpulver, die sich negativ auf eine eventuelle Schweißverbindung 48 zwischen Ventilschließgliedabschnitt 46 und Ventilhülsenabschnitt 38 auswirken, können vermieden werden. Zunächst wird das Metall¬ pulver 61 mit dem als Bindemittel 62 verwendeten Kunststoff in einer Mischvorrichtung 63 gemischt und homogenisiert. Dieses Gemisch wird nun in einer Granuliervorrichtung 64 zu einem Granulat aufbereitet und in an sich bekannter Art und Weise mittels einer Kunststoff¬ spritzgießmaschine 65 zu einem Formteil 66 weiterverarbeitet. Aus dem spritzgegossenen Formteil 66 werden anschließend die Bestand¬ teile des Kunststoffbindemittels 62 durch thermische Verfahren bei¬ spielsweise unter Schutzgaseinfluß entfernt. Das verbleibende Materialgerüst des Formteils 66 besteht nun zu ca. 60 Volumenprozent aus Metall. Um die Dichte des Formteils 66 zu erhöhen, wird das Formteil beispielsweise unter Schutzgaseinfluß in einer Sintervor¬ richtung 68 gesintert. Der Sintervorgang kann aber auch unter Wasserstoffeinfluß oder in einem Vakuum vorgenommen werden. Bei Bedarf kann das Formteil 66 dann durch heißisostatisches Pressen nachverdichtet werden, um den Anteil der Poren im Gefüge des Betätigungsteils 32 bzw. der Ventilnadel 58 auf etwa 1 % zu reduzieren. Abschließend wird bei den Ausführungsbeispielen der Ventilnadeln nach den Figuren 1 bis 4 das so erhaltene, aus Ankerabschnitt 36 und Ventilhülsenabschnitt 38 bestehende Betätigungsteil 32 mit dem Ven¬ tilschließgliedabschnitt 46 beispielsweise durch eine Schweißverbin¬ dung 48 fest verbunden.The actuating part 32, consisting of the armature section 36 and the valve sleeve section 38, and possibly also the valve closing member section 46 of the valve needle 58 are made by injection molding and closing sintering. FIG. 6 shows the method according to the invention for producing a valve needle in a simplified manner. The process, also known as metal injection molding (MIM), comprises the production of molded parts from a metal powder with a binder, for example a plastic binder, for example on conventional plastic injection molding machines, and the subsequent removal of the binder and sintering of the remaining metal powder structure. The composition of the metal powder can be matched in a simple manner to optimal magnetic properties of the actuating part 32 consisting of the armature section 36 and the valve sleeve section 38 or the valve closing member section 46. Sulfur and / or carbon in the metal powder, which have a negative effect on a possible welded connection 48 between valve closing member section 46 and valve sleeve section 38, can be avoided. First, the metal powder 61 is mixed with the plastic used as the binder 62 in a mixing device 63 and homogenized. This mixture is then processed into granules in a granulating device 64 and further processed in a manner known per se into a molded part 66 by means of a plastic injection molding machine 65. The components of the plastic binder 62 are then removed from the injection-molded part 66 by thermal processes, for example under the influence of protective gas. The remaining material structure of the molded part 66 now consists of approximately 60 percent by volume of metal. In order to increase the density of the molded part 66, the molded part is sintered, for example, under the influence of protective gas in a sintering device 68. The sintering process can also be carried out under the influence of hydrogen or in a vacuum. If required, the molded part 66 can then be densified by hot isostatic pressing in order to reduce the proportion of pores in the structure of the actuating part 32 or the valve needle 58 to approximately 1%. Finally, in the exemplary embodiments of the valve needles according to FIGS. 1 to 4, the actuating part 32 thus obtained, consisting of the armature section 36 and the valve sleeve section 38, is firmly connected to the valve closing member section 46, for example by a welded connection 48.
Die Magnetspule 1 ist von wenigstens einem, beispielsweise als Bügel ausgebildeten, als ferromagnetisches Element dienenden Leitelement 81 wenigstens teilweise umgeben, das mit seinem einen Ende an dem Kern 2 und mit seinem anderen Ende an dem Düsenträger 19 anliegt und mit diesen z.B. durch Schweißen oder Löten verbunden ist. Ein Teil des Ventils ist von einer Kunststoffummantelung 83 umschlossen, die sich vom Kern 2 ausgehend in axialer Richtung über die Magnetspule 1 mit Anschlußstecker 6 und das wenigstens eine Leitelement 81 er¬ streckt.The magnetic coil 1 is at least partially surrounded by at least one guide element 81, for example in the form of a bracket, which serves as a ferromagnetic element and which bears at one end on the core 2 and at the other end on the nozzle carrier 19 and with these e.g. is connected by welding or soldering. A part of the valve is enclosed by a plastic sheath 83, which extends from the core 2 in the axial direction over the magnet coil 1 with connector 6 and the at least one guide element 81.
Die Figur 3 zeigt ein zweites erfindungsgemäßes Ausführungsbeispiel einer Ventilnadel 58. Die Ventilnadel 58 besteht aus dem Betäti¬ gungsteil 32 sowie dem mit diesem Betätigungsteil durch eine Schweißverbindung 48 an der Anlagefläche 49 des Endes 39 des Betäti¬ gungsteils verbundenen Ventilschließgliedabschnitt 46. Das Betäti¬ gungsteil 32 hat dem Ventilschließgliedabschnitt 46 abgewandt den Ankerabschnitt 36 sowie den sich zwischen Ankerabschnitt 36 und Ven¬ tilschließgliedabschnitt 46 erstreckende Ventilhülsenabschnitt 38. Das Betätigungsteil 32 ist derart ausgebildet, daß sich der Ventil¬ hülsenabschnitt 38 ausgehend von dem Ankerabschnitt 36 in Richtung des Ventilschließgliedabschnittes 46 kegelstumpfförmig verjüngt. Diese konische Form des Ventilhülsenabschnittes 38 erleichtert die Entformung des Betätigungsteiles 32 aus den zu seiner Herstellung verwendeten Werkzeugen, z.B. aus einer Form der Kunststoffspritz- gießmaschine 65 oder der Sintervorrichtung 68. In der Längsöffnung 34 des Betätigungsteils 32 sind beispielsweise vier sich in Richtung der Ventillängsachse 11 erstreckende Ausnehmungen 85 ausgebildet. die eine Verringerung des Gewichts der Ventilnadel 58 ermöglichen, ohne ihre mechanische Festigkeit zu gefährden. Zwischen jeweils zwei Ausnehmungen 85 werden auf diese Weise an der Wandung der Längsöff¬ nung 34 des Betätigungsteils 32 in radialer Richtung nach innen weisende Stege 87 ausgeformt, die mit ihren dem Ventilschließglied¬ abschnitt 46 abgewandten Ende gemeinsam den Halteabsatz 30 für die Rückstellfeder 26 bilden.FIG. 3 shows a second exemplary embodiment of a valve needle 58 according to the invention. The valve needle 58 consists of the actuating part 32 and the valve closing member section 46 connected to this actuating part by a welded connection 48 on the contact surface 49 of the end 39 of the actuating part. The actuating part 32 facing away from the valve closing member section 46, the armature section 36 and the valve sleeve section 38 extending between the armature section 36 and the valve closing member section 46. The actuating part 32 is designed such that the valve sleeve section 38 tapers in the shape of a truncated cone in the direction of the valve closing member section 46 in the direction of the valve closing member section 46 . This conical shape of the valve sleeve section 38 facilitates the demolding of the actuating part 32 from the tools used for its manufacture, for example from a form of the plastic injection molding machine 65 or the sintering device 68. In the longitudinal opening 34 of the actuating part 32 there are, for example, four in the direction of the valve longitudinal axis 11 extending recesses 85 are formed. which allow the weight of the valve needle 58 to be reduced without compromising its mechanical strength. In this way, between two recesses 85 are formed on the wall of the longitudinal opening 34 of the actuating part 32 in the radial direction inwardly pointing webs 87, which together with their end facing away from the valve closing member section 46 together form the retaining shoulder 30 for the return spring 26.
Ansonsten unterscheidet sich die Ventilnadel 58 gemäß des zweiten, in der Figur 3 dargestellten Ausführungsbeispiels nicht wesentlich von dem in der Figur 2 dargestellten ersten Ausführungsbeispiel.Otherwise, the valve needle 58 according to the second exemplary embodiment shown in FIG. 3 does not differ significantly from the first exemplary embodiment shown in FIG.
Das dritte Ausführungsbeispiel einer erfindungsgemäßen VentilnadelThe third embodiment of a valve needle according to the invention
58 nach Figur 4 unterscheidet sich von dem ersten Ausführungsbei- spiel nach den Figuren 1 und 2 lediglich dadurch, daß der Boden 40 unmittelbar das dem Ankerabschnitt 36 gegenüberliegende Ende 39 des Betätigungsteils 32 bildet und konkav etwa der Kontur des kugel¬ förmig gestalteten Ventilschließgliedabschnittet 46 entsprechend ausgebildet ist. Der Ventilschließgliedabschnitt 46 liegt an dem Boden 40 an und ist mittels der Schweißverbindung 48 damit ver¬ bunden. Der Hohlraum 52 der vorherigen Ausführungsbeispiele entfällt bei dem dritten Ausführungsbeispiel.58 differs from FIG. 4 only from the first exemplary embodiment according to FIGS. 1 and 2 in that the bottom 40 directly forms the end 39 of the actuating part 32 opposite the anchor section 36 and concavely corresponds approximately to the contour of the spherically shaped valve closing member section 46 is trained. The valve closing member section 46 lies against the bottom 40 and is connected to it by means of the welded connection 48. The cavity 52 of the previous exemplary embodiments is eliminated in the third exemplary embodiment.
Bei dem vierten Ausführungsbeispiel einer erfindungsgemäßen Ventil¬ nadel 58 nach Figur 5 sind Ankerabschnitt 36, Ventilhülsenabschnitt 38 und Ventilschließgliedabschnitt 46 als ein Teil nach dem oben beschriebenen MIM-Verfahren hergestellt. Dabei erstreckt sich vor¬ teilhafterweise die Längsöffnung 34 bis in den Ventilschließglied¬ abschnitt 46. Schweißverbindungen sind bei dem vierten Ausführungs¬ beispiel nach Figur 5 nicht vorhanden.In the fourth exemplary embodiment of a valve needle 58 according to the invention according to FIG. 5, armature section 36, valve sleeve section 38 and valve closing member section 46 are produced as one part according to the MIM method described above. The longitudinal opening 34 advantageously extends into the valve closing member section 46. Welded connections are not present in the fourth embodiment according to FIG. 5.
Die neue Ventilnadel mit einem durch Spritzgießen und anschließendes Sintern hergestellten, aus Ankerabschnitt 36 und Ventilhülsen- abschnitt 38 bestehenden Betätigungsteil 32 bzw. mit dem ebenfalls zugleich gefertigten Ventilschließgliedabschnitt 46 hat den Vorteil einer sehr einfachen und kostengünstigen Herstellung, bei der der Schweißarbeitsgang zwischen Ankerabschnitt 36 und Ventilhülsenab¬ schnitt 38 und ggf. auch zwischen Ventilhülsenabschnitt 38 und Ventilschließgliedabschnitt 46 entfällt. Der durch den Sacklochab¬ schnitt 44 der Längsöffnung 34 des Betätigungsteils 32 und dem Ventilschließgliedabschnitt 46 gebildete Hohlraum 52 führt dazu, daß bei der in den Ausführungsbeispielen nach den Figuren 1 bis 4 vorge¬ sehenen Ausbildung der Schweißverbindung 48 zwischen Ventilschlie߬ gliedabschnitt 46 und dem Ende 39 des Betätigungsteils 32 ent¬ stehende Schweißspritzer in dem Hohlraum 52 verbleiben und nicht die Funktion des Ventils stören können. The new valve needle with an injection molded section and subsequent sintering, consisting of armature section 36 and valve sleeve Section 38 existing actuating part 32 or with the valve closing member section 46, which is also manufactured at the same time, has the advantage of very simple and inexpensive production, in which the welding operation between the armature section 36 and the valve sleeve section 38 and possibly also between the valve sleeve section 38 and the valve closing member section 46 is eliminated. The cavity 52 formed by the blind hole section 44 of the longitudinal opening 34 of the actuating part 32 and the valve closing member section 46 leads to the fact that, in the exemplary embodiments according to FIGS. 1 to 4, the welded connection 48 is formed between the valve closing member section 46 and the end 39 of the actuating part 32 resulting welding spatter remain in the cavity 52 and cannot interfere with the function of the valve.

Claims

Ansprüche Expectations
1. Ventilnadel für ein elektromagnetisch betätigbares Ventil, insbe¬ sondere für ein Einspritzventil für Brennstoffeinspritzanlagen von Brennkraftmaschinen, das einen Kern, eine Magnetspule und einen festen Ventilsitz hat, mit dem die aus einem Ankerabschnitt, einem Ventilhülsenabschnitt .und einem Ventilschließgliedabschnitt be¬ stehende Ventilnadel zusammenwirkt, wobei der Ventilhülsenabschnitt den Ankerabschnitt mit dem Ventilschließgliedabschnitt verbindet und eine Längsöffnung sich durch den Ankerabschnitt und den Ventil¬ hülsenabschnitt erstreckt, dadurch gekennzeichnet, daß zumindest der Ankerabschnitt (36) und der Ventilhülsenabschnitt (38) der Ventil¬ nadel (58) als ein Teil durch Spritzgießen und anschließendes Sintern nach dem Metal-Injection-Molding-Verfahren hergestellt ist.1. Valve needle for an electromagnetically actuated valve, in particular for an injection valve for fuel injection systems of internal combustion engines, which has a core, a magnetic coil and a fixed valve seat with which the valve needle, which consists of an armature section, a valve sleeve section, and a valve closing member section, interacts , wherein the valve sleeve section connects the armature section with the valve closing member section and a longitudinal opening extends through the armature section and the valve sleeve section, characterized in that at least the armature section (36) and the valve sleeve section (38) of the valve needle (58) as one part is produced by injection molding and subsequent sintering according to the metal injection molding process.
2. Ventilnadel nach Anspruch 1, dadurch gekennzeichnet, daß die Längsöffnung (34) nahe an einem dem Ventilschließgliedabschnitt (46) zugewandten Ende (39) des Ventilhülsenabschnittes (38) einen Boden (40) hat.2. Valve needle according to claim 1, characterized in that the longitudinal opening (34) close to one of the valve closing member portion (46) facing end (39) of the valve sleeve portion (38) has a bottom (40).
3. Ventilnadel nach Anspruch 1, dadurch gekennzeichnet, daß an einem dem Ventilschließgliedabschnitt (46) zugewandten Ende (39) des Ventilhülsenabschnittes (38) ein Boden (40) vorgesehen ist.3. Valve needle according to claim 1, characterized in that a bottom (40) is provided on an end (39) of the valve sleeve section (38) facing the valve closing member section (46).
4. Ventilnadel nach einem der Ansprüche 1 bis 3, dadurch gekenn¬ zeichnet, daß der Ventilschließgliedabschnitt (46) mittels einer Schweißverbindung (48) mit dem dem Ankerabschnitt (36) abgewandten Ende (39) des Ventilhülsenabschnittes (38) verbunden ist. 4. Valve needle according to one of claims 1 to 3, characterized gekenn¬ characterized in that the valve closing member portion (46) by means of a welded connection (48) with the armature portion (36) facing away from the end (39) of the valve sleeve portion (38).
5. Ventilnadel nach Anspruch 1, dadurch gekennzeichnet, daß Ankerab¬ schnitt (36), Ventilhülsenabschnitt (38) und Ventilschließgliedab¬ schnitt (46) der Ventilnadel (58) als ein Teil nach dem Metal-Injection-Molding-Verfahren hergestellt sind.5. Valve needle according to claim 1, characterized in that Ankerab¬ section (36), valve sleeve section (38) and valve closing member section (46) of the valve needle (58) are manufactured as a part according to the metal injection molding process.
6. Ventilnadel nach einem der vorhergehenden Ansprüche, dadurch ge¬ kennzeichnet, daß sich der Ventilhülsenabschnitt (38) ausgehend von dem Ankerabschnitt (36) in Richtung des Ventilschließgliedab¬ schnittes (46) verjüngt.6. Valve needle according to one of the preceding claims, characterized ge indicates that the valve sleeve section (38) tapers starting from the armature section (36) in the direction of the valve closing member section (46).
7. Ventilnadel nach einem der vorhergehenden Ansprüche, dadurch ge¬ kennzeichnet, daß in der Wandung der Längsöffnung (34) des Ventil¬ hülsenabschnittes (38) sich in Richtung einer Ventillängsachse (11) erstreckende Ausnehmungen (85) ausgebildet sind.7. Valve needle according to one of the preceding claims, characterized ge indicates that in the wall of the longitudinal opening (34) of the Ventil¬ sleeve portion (38) in the direction of a valve longitudinal axis (11) extending recesses (85) are formed.
8. Verfahren zur Herstellung einer Ventilnadel, insbesondere einer nach einem der Ansprüche 1 bis 7 ausgebildeten Ventilnadel, die aus einem Ankerabschnitt, einem Ventilschließgliedabschnitt und einem den Ankerabschnitt mit dem Ventilschließgliedabschnitt verbindenden Ventilhülsenabschnitt besteht, dadurch gekennzeichnet, daß ent¬ sprechend dem Metal-Injection-Molding-Verfahren in einem ersten Ver¬ fahrensschritt ein Metallpulver und ein Bindemittel miteinander ge¬ mischt und homogenisiert werden, in einem zweiten Verfahrensschritt durch Spritzgießen ein wenigstens aus dem Ankerabschnitt (36) und dem Ventilhülsenabschnitt (38) bestehendes Formteil (66) hergestellt wird, in einem dritten Verfahrensschritt das Bindemittel aus dem Formteil (66) entfernt wird und in einem vierten Verfahrensschritt das Formteil (66) gesintert wird.8. A method for producing a valve needle, in particular a valve needle designed according to one of claims 1 to 7, which consists of an armature section, a valve closing member section and a valve sleeve section connecting the armature section to the valve closing member section, characterized in that corresponding to the metal injection Molding process in a first process step, a metal powder and a binder are mixed and homogenized, in a second process step a molded part (66) consisting at least of the armature section (36) and the valve sleeve section (38) is produced by injection molding, in a third process step the binder is removed from the molded part (66) and in a fourth process step the molded part (66) is sintered.
9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß in einem fünften Verfahrensschritt der Ventilschließgliedabschnitt (46) mittels einer Schweißverbindung (48) mit dem Ventilhülsenabschnitt (38) verbunden wird. 9. The method according to claim 8, characterized in that in a fifth step, the valve closing member portion (46) by means of a welded connection (48) with the valve sleeve portion (38) is connected.
10. Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß Ankerab¬ schnitt (36), Ventilhülenabschnitt (38) und Ventilschließgliedab¬ schnitt (46) als ein Formteil (66) ausgebildet sind.10. The method according to claim 8, characterized in that Ankerab¬ section (36), valve sleeve section (38) and valve closing member section (46) are formed as a molded part (66).
11. Verfahren nach Anspruch 8 oder 10, dadurch gekennzeichnet, daß als Bindemittel ein Kunststoff verwendet wird.11. The method according to claim 8 or 10, characterized in that a plastic is used as a binder.
12. Verfahren nach Anspruch 8, 10 oder 11, dadurch gekennzeichnet, daß das Bindemittel durch eine thermische Behandlung des Formteils (66) aus diesem Formteil (66) entfernt wird.12. The method according to claim 8, 10 or 11, characterized in that the binder is removed by a thermal treatment of the molded part (66) from this molded part (66).
13. Verfahren nach einem der Ansprüche 8 oder 10 bis 12, dadurch gekennzeichnet, daß das Formteil (66) nach dem Sintern heiß- isostatisch gepreßt wird. 13. The method according to any one of claims 8 or 10 to 12, characterized in that the molded part (66) is hot-isostatically pressed after sintering.
PCT/DE1993/000759 1992-09-11 1993-08-20 Valve needle for an electromagnetically controlled valve and process for producing the same WO1994007024A1 (en)

Priority Applications (5)

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US08/240,704 US5566920A (en) 1992-09-11 1993-08-20 Valve needle for an electromagnetically actuable valve and method for manufacturing the valve needle
EP93918902A EP0612375B1 (en) 1992-09-11 1993-08-20 Valve needle for an electromagnetically controlled valve and process for producing the same
KR1019940701566A KR100292420B1 (en) 1992-09-11 1993-08-20 Valve needle for electromagnetic actuated valve and manufacturing method
JP6507648A JPH07501377A (en) 1992-09-11 1993-08-20 Valve needle for electromagnetically actuated valves and its manufacturing method
DE59306788T DE59306788D1 (en) 1992-09-11 1993-08-20 VALVE NEEDLE FOR AN ELECTROMAGNETICALLY ACTUABLE VALVE AND METHOD FOR THE PRODUCTION THEREOF

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Application Number Priority Date Filing Date Title
DEP4230376.1 1992-09-11
DE4230376A DE4230376C1 (en) 1992-09-11 1992-09-11

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US (1) US5566920A (en)
EP (1) EP0612375B1 (en)
JP (1) JPH07501377A (en)
KR (1) KR100292420B1 (en)
DE (2) DE4230376C1 (en)
ES (1) ES2103485T3 (en)
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Also Published As

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EP0612375A1 (en) 1994-08-31
EP0612375B1 (en) 1997-06-18
KR100292420B1 (en) 2001-10-22
DE4230376C1 (en) 1993-04-22
US5566920A (en) 1996-10-22
ES2103485T3 (en) 1997-09-16
JPH07501377A (en) 1995-02-09
DE59306788D1 (en) 1997-07-24

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